Rotary gate valve



- sept, 24, 12946.

FEL-'6.1.

H. G. NASH ROTARY GATE VALVE Filed Dec. 17, 1945/ 2 Sheets-Sheet l INVENTR /fkfr GT /VASH ATTORN EYS sept. 24, 1946. -H. G. NASH 2,408,223

' ROTARY GATE VALVE Filed Dc. 17, 1943 2 Sheets-Sheet 2 7 zag? l lNvENToR `3.5 9 /5 y Hfs-Rafa? G AMS/f BY Y ATTORNEYS Patented Sept. 24, 1946 UNITED STATES PATENT OFFICE sacarme ROTARY GAtlItf-VALVEv Herbert G. Nash, Kew Garaensm. Y'.

Application December 17, 1943;,S'erial No: 514,626

(c1. 7er-22.).-

2 Claims.

This inventionrelates to improvements in valve structures and more specifically to a rotary gatevalve.

The primary object of the'invention resides-in a rotary valve in which the rotary valve member may be successively freed from its seat, rotated from closed to open position or vice versa, and subsequently reseatedupon its valve seat byl means of a single continuous manipulation of the valve y actuating means.

Other novel features of the invention will become apparent as the following specification is read in conjunction with the accompanying drawings, in which,

Figure 1 is a vertical sectional view of my valve with the parts in valve closingl position, the;valve member being illustrated in seated engagement with its seat in full lines, and in freed relation thereto in dotted lines.

Figure 2 is a horizontal sectional view on the line 2-2 of Figure 1.

Figure 3 is a vertical sectional view taken on the line' 3-3 of Figure 2, with the parts of the valve shown in open position, the valve member ybeing shown seated in full lines and in raised valve in its entirety. which includes a valve body` I I composed of a lower annular casing section I2, an intermediate orbonnet section I3, and a cap section; I4. The sections I2, I3 and I4 are arranged in superposed relation with the bonnet.

section I3 bolted to the open top of the lower section as at. I5, and with the cap section-bolted to the top of the bonnet section as at I6.

The lower section I2 is cast in one piece and includes a valve casing I1 having a downwardly tapered valve seat I8. The casing also includes diametrically opposed inlet and outlet ports I9 and respectively which open through the valve seat I8. The bottom 2| of the casing is closed andis provided with a. central bearing 22. Inter-A posed between the lower section I2 and the bonnetV I3 is a bearing plate 23, which plate closes the top of the casing and-has a bearing opening 24 inaxial alinement with the bearingv 22.

Mounted within the casing I1 for rotative and vertical movement is a valve member 25 which and'V axiallytherefrornV isa valve stem 29, the

samefreely'passing through the bearing opening 24- and an axiallyalinedbearing opening 3i) in the-bottom wall 3|! of a cylindrical casing 32, which casing constitutes the upper portion of'the bonnet I3. Theupper free end of the stem 29 extends'v intothe casing132.V and is provided with lefty screw threads 33. A packing gland 34 carried byl the-plate 23 surrounds the stem 29 to seal thebearing between said stem and plate.

Interposed between the top of the bonnet I3..

and the capv IIIY is a bearing plate 35i having a bearing opening-36 coaxial with the'stem 29 and with a bearing opening 31 in the cap section I4. Journalledin the bearing openings 31 and 36 is an actuating stem 38 having a collar 39 disposed between the capsection I4-and-bearing plate 35 and which forms a swivel connection between the stem 38- and cap section I4`forr reasons to be hereinafter; explained. The lower or inner end of the stem 38 extends into the bonnet casing 32 in spaced coaxial Irelation to the upper end of thev stem-29 and is provided with right screw threads.

40. Thetop or outer end ofthe stemf38 has a lmanipulating element in thev form of a handwheel'l I 'fixed thereto.

The spaced threaded ends of the stems 23 and 38 are connected Lby a coupling member 42 which.

comprises-.a cylindricalbody 43 having threaded sockets 44iand45-Jrespectively which are complementary=to and tlsireadedlyv engage the threaded portions33 andv 43., A transverseV partition wall 46 separates thesocketsM and 45` and when thev valve member: 25 is in closed seated position as illustrated in .Figure lzthe'lower end ofthe stem 38abuts thepartition wall 46, while theupper end of the stem 29 is in spaced relation to said partition wall; However, when the valve member 25 is in open seatedposition as shown in Figurev 3, the lower4 end. of the stem 38V isdisposed inv spaced relation tothe wall. 46 while the upper end of .thestem 29 is'A in contactinggengagement therewithforreasons to be hereafter pointed out.

Thecoupling. member, 42 constitutes a double nut -whichfis alternately` keyedto the respectivestems 29 and 38' during. each complete turning of'ftheA valve-member 25arfrom seated closed to,

seated open position and vice versa. The actual turning movement of the valve member from closed to open position and vice versa is through an arc of 90 as illustrated in Figure 4, there being an added 30 turning movement of the actuating stem 38 relative to the valve member 25 and its stem 29 prior to turning movements of the valve member to either open or closed positions and also a 30 turning movement of the stem 38 subsequent to the limit of movement of the valve member to either open or closed position. Thus as each single continuous turning movement. in one direction is imparted to the actuating stem 38 to move the valve member from open to closed position, or vice versa, the stem 38 and its actuating handwheel 4I travels a total of. 150 of a circle. The degrees of turning movements stated herein are arbitrary and may vary if desired.

For alternately keying the stems 29 and 38 to the coupling member 42, I provide a vertically disposed rock arm 41 which is pivoted to the ilattened side of the member 42 as at 48. Flat locking keys 49 and 50 are respectively connected to the lower and upper ends of the rock arm 41 by pin and slot connections l. The locking keys 49 and 53 freely slide through horizontal openings 52 in the body 43 of member 42 for alternate entry into keyways 53 and 54 in the stems 29 and 38. When the valve member 25 is in closed seated position and during its turning movement to open unseated position, the key 49 is free of its keyway 53 while the key 59 is extending into its keyway 54. When the valve member 25 reaches open position with the passage 21 in register with the ports I9 and 29, the positions of the keys are reversed, that is, the key 50 is disengaged from its keyway 54 and the key 49 simultaneously moved into its keyway 53. The reverse actuation takes `place during turning movement of the valve member 25 from open seated position to closed seated position and is accomplished by cams 55 and 56 respectively disposed above and below the plane of the pivotal axis of the rock arm 41 and disposed in the path of the outer sides thereof.

For limiting the turning movements of the valve member 25 to open and closed positions within the range of an arc of 90, I provide a stop lug 51 on the underside of the plug body 26 which is in thecircumferential path of a pair of iixed spaced radially disposed stop lugs 58 and 59 respectively (Figure 1).v

In practice, assume that the valve i8 is closed as shown in Figures 1 and 2 and it is desired to open the same. The operator grasps the handwheel 4i and imparts a turning movement theretc in a counterclockwise direction. Upon initial turning of the actuating stem 38 it will cause the coupling member to turn therewith due to the key 59 being in its keyway 54, thus causing the left threadconnection 44-33 to impart an upward vertical movement to the stem 29 and its valve member 25 which disengages the valve member 25 from its seat I8 as illustrated in dotted lines in Figure 1. The top end of the valve stem 29 is now engaging the partition wall 46 and continued turning of the actuating stem 33 will cause the valve stem 29, valve member 25, and coupling member 42 to turn as a unit. As the valve member 25 reaches the limit of its turning movement to open position,-the lower portion of the rocker arm engages the cam 55 which imparts a rocking movement to the rock arm and causes the retraction of the key 50 from keyway 54 and simultaneously moves the key 49 into its keyway 53. The valve member 25 is stili unseated' but with the stem 29 keyed to the coupling member 42, continued turning of the stem 38 in a counterclockwise direction will cause the coupling member 42, stem 25, and valve member 25 to move vertically downward to reseat the valve member upon its seat 18 while in an open position as best illustrated in Figure 3.

To move the valve member 25 from its open position shown in Figure 3 to its closed position shown in Figure 1 requires a reverse cycle from that described for moving the same from closed to open position. Assume that the parts are as shown in Figure 3. The operator grasps the handwhcel 4| and imparts a clockwise turning movement thereto which causes the stem 38 to thread into its recess 45 and engage wall 45 which imparts a vertical upward movement to be imparted to the stem :29 and its valve member 25 to the dotted position shown in Figure 3. The valve member 25 is now unseated and, continuous turning of the stem 38, causes the coupling member, stem 29 and valve member 25 to turn as a unit to closed position. When reaching closed position, the upper end of the rock arm 41 engages cam 55 causing the rock arm to reverse its position which effects disengagement of the key 49 from its keyway 53 and simultaneously moves key 50 into its keyway 54. The stem 38 is now keyed to coupling member 42 while the stem 29 is unkeyed therefrom. Continued turning movement of the actuating stem 38 will cause the coupling member 2 to turn therewith and impart a vertical downward movement to the stem 29 and Valve member 25 to reseat the same to the full line position shown in Figure l. Thus, by a single continuous turning movement imparted to the manipulating hand-wheel 4|, the valve member 25 may be successively disengaged from its seat, moved to either open` or closed position, and nally reseated. The seating of the valve member 25 in both its open and closed positions prevents foreign matter from accumulating within the valve casing which, in time, may build up and affect the free and ecient operation of the valve.

To eifect a more ypositive seating of the Valve member 25, I mount rockable gates -60 in those opposed outer sides of the valve body 26 which are exposed to the inlet and outlet ports I 9 and 29 when the valve member is in closed position. The gate members 6B are concavo-convex in cross section and are respectively disposed in recesses lil-6|. The gate members extend substantially the height of the valve body 26 and are of a width to respectively bridge the inlet and outlet ports as best seen in Figure 5. A fulcrum rib B2 extends outwardly from the closed side wall of each recess and on which the related gate B9 fulcrums. The gates 60 are free to rock and adapt themselves to the seat I8 during wear and provide a positive seal between the valve casing i1 and the valve member 25 when the valve is in closed position as best seen by reference to Figures l, 5, and 6.

While I have shown and described what I consider to be the preferred embodiment of my invention, I wish it to be understood that such changes in construction and design as come within the scope of the appended claims may be resorted to if desired without departing from the spirit of my invention. Though primarily designed for the actuation of valves, the mechanism can of course be utilized in connection with other apparatus that requires to be operated and controlled inthe same way.

What I claimis: A

1. In a. mechanism for impartingi'lift-turn Y movements to a member having a lstem provided with a threaded'portion, an actuating stem. in axial alinement with said first stemand in spaced relation to one end thereof, said actuating stem having ya. threaded portion of `a reverse rpitch from the threaded portion on therststem, a

respective stems, and Xed cam elements respec- Y tively disposed in the path of the rock arm at opposite sides of the pivotal axis of the rock arm and with Which the opposed end portions of the v rock arm respectively engage.

2. In a mechanism for imparting lift-turn l movements to a member, a rigid housing, a pair of coaxial stems respectively journalled in opposed Walls of said housing with their inner ends in spaced relation, reversely pitched screw threads providedon the adjacent end portions of the respective stems, one of said stems being connected` to the member to beelifted and turned, a manipulating element fixed to the outer end of the other of said stems, a `coupling nut having opposedV axially alined screw threaded sockets complemenf tary to the respective threads on said stems and with which they threadingly engage, a rock arm pivoted at the side of the coupling nut, key pins Apivoted to the ends of the rock arms, keyways provided in the threaded end of the stems for a1- ternately receiving the key pins, and cam means provided within the housing in the path ofthe vends of the rock arm and With which the same engages during alternate turning ,movementl of the coupling nut in reverse directions to eiect alternate engagement and disengagement of the vkey pins in their related keyvvays.

HERBERT G.'NAsH. 

